2018 FINA World Swimming Championships (25 m) – Mixed 4 × 50 metre medley relay

The mixed 4 × 50 metre medley relay competition of the 2018 FINA World Swimming Championships (25 m) was held on 13 December 2018.

Records
Prior to the competition, the existing world and championship records were as follows.

The following records were established during the competition:

Heats
The heats were started at 11:25.

Final
The final was held at 20:50.